Results 11 to 20 of about 320,647 (167)

April 2000 geomagnetic storm: Ionospheric drivers of large geomagnetically induced currents [PDF]

, 2003
International audienceGeomagnetically induced currents (GIC) flowing in technological systems on the ground are a direct manifestation of space weather. Due to the proximity of very dynamic ionospheric current systems, GIC are of special interest at high
Thomson, A., A. Thomson, A. Pulkkinen, E. Clarke, Pulkkinen, A., Clarke, E., A. McKay, McKay, A.   +7 more
core   +5 more sources

Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp [PDF]

, 2001
On 14 January 2001, the four Cluster spacecraft passed through the northern magnetospheric mantle in close conjunction to the EISCAT Svalbard Radar (ESR) and approached the post-noon dayside magnetopause over Greenland between 13:00 and 14:00 UT.
Eglitis, P., Stauning, P., Voronkov, I., Ruohoniemi, J. M., Moen, J., Orsini, S., Stamper, R., Wild, M., Lockwood, M., Cerisier, J. C., Jackal, B., Behlke, R., Candidi, M., Bosqued, J. M., Cully, C., Sedgemore-Schulthess, F., Villain, J. P., Dunlop, M. W., Donovan, E., Fazerkerley, A., Rème, H., Denig, W. F., Mann, I. R., André, M., Alcaydé, D., Lester, M., Alleyne, H., Engebretson, M. J., Buchert, S., Blelly, P. L., Greenwald, R. A., Cornilleau-Wehrlin, N., Kelly, J. D., Vaivads, A., McCrea, I. W., Watermann, J., André, R., Balogh, A., Boholm, H., Masson, A., Lu, G., Strömme, A., Schott, J. J., Amm, O., Milling, D. K., Kauristie, K., Taylor, M., Maksimovic, M., Provan, G., Marcucci, M. F., Borälv, E., Wild, J. A., van Eyken, A. P., Samson, J. C., Krauklis, I., Massetti, S., Décréau, P. M. E., Pitout, F., Opgenoorth, H. J.   +58 more
core   +6 more sources

On the origin of high m magnetospheric waves [PDF]

, 2010
A survey of Advanced Rio-Imaging Experiment in Scandinavia data reveals evidence for a previously overlooked generation mechanism of high azimuthal wave number magnetospheric waves.
Honary, F., Kavanagh, Andrew J., Beharrell, Matthew J.   +2 more
core   +4 more sources

Towards a synthesis of substorm electrodynamics : HF radar and auroral observations [PDF]

, 2006
At 08:35 UT on 21 November 2004, the onset of an interval of substorm activity was captured in the southern hemisphere by the Far UltraViolet (FUV) instrument on board the IMAGE spacecraft. This was accompanied by the onset of Pi2 activity and subsequent
Tim K. Yeoman (7583066), P. L. Dyson, J. C. Devlin, H. U. Frey, Devlin, J. C., Parkinson, M. L., Lester, M., M. L. Parkinson (7591427), P. L. Dyson (7591430), Grocott, A., Dyson, P. L., M. Lester, M. L. Parkinson, H. U. Frey (7591265), Adrian Grocott (7590026), T. K. Yeoman, A. Grocott, Frey, H. U., Mark Lester (6477935), Yeoman, T. K., J. C. Devlin (7591433)   +20 more
core   +6 more sources

Revised time-of-flight calculations for high-latitude geomagnetic pulsations using a realistic magnetospheric magnetic field model [PDF]

, 2005
We present a simple time-of-flight analysis of Alfvén pulsations standing on closed terrestrial magnetic field lines. The technique employed in this study in order to calculate the characteristic period of such oscillations builds upon earlier time-of ...
Waters, C. L., Yeoman, T. K., Wild, James A.   +2 more
core   +4 more sources

Field-aligned currents and ionospheric parameters deduced from EISCAT radar measurements in the post-midnight sector [PDF]

, 2002
International audienceAttempting to derive the field-aligned current (FAC) density using the EISCAT radar and to understand the role of the ionosphere on closing FACs, we conducted special radar experiments with the EISCAT radar on 9 October 1999.
Nagatsuma, T., Gjerloev, J. W., S. Nozawa, T. Nagatsuma, M. Sugino, S. C. Buchert, Nozawa, S., Fujii, R., Buchert, S. C., Kosch, M. J., M. J. Kosch, Sugino, M., R. Fujii, J. W. Gjerloev   +13 more
core   +6 more sources

Surface conductivity of Mercury provides current closure and may affect magnetospheric symmetry [PDF]

Annales Geophysicae, 2004
We study what effect a possible surface conductivity of Mercury has on the closure of magnetospheric currents by making six runs with a quasi-neutral hybrid simulation.
P. Janhunen, E. Kallio
doaj   +1 more source

Recreating the Horizontal Magnetic Field at Colaba During the Carrington Event With Geospace Simulations

Space Weather, 2021
An intriguing aspect of the famous September 2, 1859 geomagnetic disturbance (or “Carrington” event) is the horizontal magnetic (BH) data set measured in Colaba, India (magnetic latitude approximately 20°N).
Seán P. Blake, Antti Pulkkinen, Peter W. Schuck, Alex Glocer, Denny M. Oliveira, Daniel T. Welling, Robert S. Weigel, Gary Quaresima   +7 more
doaj   +1 more source

Azimuthal magnetic fields in saturn's magnetosphere: Effects associated with plasma sub-corotation and the magnetopause-tail current system [PDF]

, 2003
We calculate the azimuthal magnetic fields expected to be present in Saturn’s magnetosphere associated with two physical effects, and compare them with the fields observed during the flybys of the two Voyager spacecraft.
Cowley, S. W. H., Bunce, E. J., Wild, J. A.   +2 more
core   +6 more sources

Simultaneous inversion for source field and mantle electrical conductivity using the variable projection approach

Earth, Planets and Space, 2023
Time-varying electromagnetic field observed on the ground or at a spacecraft consists of contributions from (i) electric source currents, such as those in the ionosphere and magnetosphere, and (ii) corresponding fields induced by source currents within ...
Jingtao Min, Alexander Grayver
doaj   +1 more source